Selective signaling system for party-lines.



E. B. CRAFT.

SELBCTIVE SGNALING SYSTEM FOR PARTY LINES.

APPLICATION FILED JUNE 29,1910.

Patented Feb. 176, 1915.

EDWARD B.' CRAFT, or Hackensack, NEW JERSEY, Assrenon To WESTERN ELECTRIC coMPANY, or NEW YORK, 'n'. Yi, A eoRPoRAmIoN or Immers.

snLEecrIvE sreNALINe sys'rmr rea PARTY-uniss.

meses?.

T0 all whom t may concern:

Be it known that I, EDWARD B. CRAFT, citizeny of the United States, residing at Hackensack, inthe county of Bergen and State of New Jersey, haveinvented a certain new and useful Improvement in Selective Signaling Systems for Party-Lines, of which the followin is a full, clear, concise, and exact description. i

This invention relates to selective signal .ing systems for party lines and has for its object to' provide means in connection with train despatching systems whereby various forms of signals for di ierent be sent out over the line to the various `stations. i

It is customary on train wires at certain periods duringthe day to notify the station operators of the correct time. It is the general practice where Morse is used to spell out the word time at a predetermined time and at a certain interval after this word has been sent over the line to send out a predetermined number of dots each dot being sent out at a given instant.

This invention is particularly adapted for use in connection-With a system wherein a plurality of way stations on one line are each provided ywith a selector having 'a ratchet wheel adapted in response to impulses sent out from a despatehers station ,to be rotated to close a circuit through a bell, whereby the bell will be vibrated to signal the operator at the station. In this invention each of the selectors is provided 4with an extra contact which :is closed in respouse to a different number of impulses than are required to close the circuit for operating the vibrating bell, the closing ot' said eXtra contact closing a circuit through the bell whereby said bell operates as a singie stroke one in response to impulses sent over the line.

The drawing isaschematic diagram illustratmg the arrangemen/t of apparatus and clrcuits.

In said drawing, 1 and 2 designate the line wires, A a despatchers station and B one way station on the line, the number of way stations on a line varying. Retardation coils 3, 4f and 5 are connected in the line for the purpose of smoothing out the current impulses which are sent over the line for operating the selectors.

As shown each of the Way stations B is Specication of Letters leten't. application.- aiea Juneee, i910. serial No. 569,514.

purposes may Patented rei). ic, rois.

equipped with la selector mechanism 1.0, a signaling bell 11 and a telephone set 12, all in bridge of said line. The selector mechanism 10 comprises a slow and a quick acting magnet-13 and 14 and a ratchet wheel 15 controlled thereby,.said ratchet wheel having attached-thereto la contact arm 16 adapted in the rotation of said pawl 15 to be brought separately into register with contacts 17' andI l8'said contact 18 also acting as a stop for said ratchet wheel for limitingl its 'forward movement. lll/Then the Contact arm 16 is registeringF with the Contact 17, there will be a circuit completed from one side ofthe train wire through a conductor 20, the contact' arm 16, Contact 17, condnctor 21, armature 22 of the ringer, conductor 24;, the windings of the bell 1l and a conductor 25 to the other side of the line. When completed the circuit above traced forms a path for current throughl the bell winding and armature which causes said bell to vibrate. When the contact at 18 is closed there will be` a dill'lerent path for the current through the bell magnet which will cause said bell to operate as a single stroke'one, inpjtraced from one side of the line through conductor 20, the contact arm 16, contact 18. conductor 27, and the winding of the hell magnet to the other side of the line. The contacts 17 of each selector' are closed each in response to a different number of impulses dependinglr upon the distance from the despatchers station while the contacts 18 on all of the selectors are closed by the same number of impulses, the

this pa thl benumber of impulses required to close said contact 18 being different from the number required to close the Contact 17 on any one ofthe selectors. Separate sendingr devices are preferably provided one for operating the selector at each station to close the circuitv for vibratingthe bell. the other for closing' the circuits at all of the stations for operating the bell at each 'station as a sinfle stroke bell. lVhen used as a single stroke bell it is caused to tap by opening` and closingr the sending circuit by means of the apparatus at the despatchers station.

Iwleierriner now to the arrangement ot' ap'- paratus and circuits at the despatchers station, it will be noted that the line wires 1 and 2 terminate in front contacts 30 andk 31 of impulse relays 32 and 38, the armature of said relays being` in series with a battery 34h. A sender key 35 connected in series with the impulse relays and a local battery 36 through vone spring of al switching key 3T is -adapted 5 to send the impulses over vthe line forclosing the circuit at the way stationfor vibrating the belll` whilea second sender 3S connected in series with the impulse relays and local battery 3G through the other contact of the key 35 andthe backcontactof a relay. 39 is adapted to step'the selectors' around -to close the circuits for operating the bell as a single stroke one. The relay 39 is adapted to be controlled by a relay i0 to open'and close the circuit through. the impulse relays when Vthe contacts 1S of the. selectors are closed, thereby sending impulses over the line and causing the bell to tap once for every clo, sureot' said circuit.

sent. out from the despatcher`s otiice or from vsomeoirice locatedat a distance from the The signals may be despatchers oiiice.

The operation .of the parts `hereinbefore described is as follows,

waystations the sending key to send out over 4the line the the signal for vibrating the bell. The local circiiit'a't the sending station when selective signaling is Vtaking place will be from the local battery 3G through a conductor v50. the windingsot` the impulse relays 32 and 33, contacts l and 52 of tlie'sendirig switch 35,

. 3.5l a conductor 53, the switch 3T and conductor 54 to the other side of the battery 3G. When timesignals-are to be senty out over'the line the switch 37 will be thrown to cut the sender out of circuit and the sender 38 40 into circuit. The local circuit will nou' be from one side of the battery 36through con- '.ductor 50, the winding of the impulse relavs 32 and 33, conductor 56, back contact of A tlie relay 39, conductor 5T, contacts of the yarranged as A S- 25 siiining-tirst that it desired to selectively signal one of vthe is operated exact number of impulses necessary. to close sender 3S, conductor 58, the switch 37 and conductor 5l to the other side of the battery. The'operation of the sender 38 sends the selector around until the contactl 1S is closed current still being maintained on the line through the sending' apparatus. Now when .the circuit through the time relay 40 is' .opened and closed it will vopen and close the impulse Vrelays 32 andA 33 which will send current impulses over the line the selector being now in a` position where it can move no farther forward these impulses will have no effect on it except possibly to open :und`

close the centact lS'but will pass through said contact 1S and the bell windingcausing said bell to signal with single strokes, the period between the Aimpulses being too short to permit the slow acting magnet of. the selector to operate but being of sufficient durationto cause the operations of the impulse holdcurrent on 'the line for a period after selection, interrupting the closed circuit of one of mechanisms. i

In witness whereofnI hereunto subscribe my naine this 28th day of June A. D.,1910.

EDWARD CRAFT.

' Witnesses:

GUY M. CAMPBELL, Invixo MACDONALD and electromagnetic mechanismfoi A 

